Level 2 - About the Data
Aquarius Level-2 salinity data are provided by NASA. Data may be accessed through http://podaac.jpl.nasa.gov/AquariusDataAccess. The Aquarius level-2 product is generated from one Aquarius Level-1A data file. It comtains physical measurements as computed from the Level1-1A raw data along with coordinates of viewed locations and nagigation data. Avaliable data sets include:
- ADPS V3.0, which uses modeled wind data for the SSS retrival;
- Combined Active-Passive (CAP) V3.0, which uses the onboard scatterometer for simultaneous colocated windseed/surface roughness observations.
The SMOS Level-2 Ocean Salinity data is provided by European Space Agency (ESA). Data may be accessed through http://earth.esa.int. The iterative retrieval method that is implemented in the SMOS L2 processor is able to derive Sea Surface Salinity, and some information on other geophysical parameters depending on the forward model used in the iterative scheme. The forward model accounts for main contributions to the measurements. For one of these contributions, the one due to the roughness of sea surface, three sub-models are implemented in parallel in the processor. For this reason, most geophysical parameters in the output products are repeated three times.
Both self-consistency and cross-consistency are tested in order to do the quality monitor to the Level-2 data. The basic statistical analysis performed includes maps, histograms, Hovmoller diagrams, time series and dependencies.
The satellite Level2 data was matchuped up with the Argo profiling float data. The satellite data within 75km spatially and 7 days temporally of each Argo profile were selected and averaged to represent the satellite data at the Argo location.